Volunteers need considerable resiliency to cope with formidable challenges during their operations in disaster scenes. The present study was conducted to identify factors affecting the different aspects of resiliency among volunteers in disasters. The databases of Web of Science, Scopus, PubMed, ProQuest, Google Scholar, World Health Organization Library, International Committee of the Red Cross (ICRC) Library, PsycArticles, and SafetyLit were searched until September 29, 2018. The main search terms were resiliency, disaster, humanitarian aid worker, and volunteer. A total of 548 documents were obtained and screened based on the inclusion and exclusion criteria. A number of 8 documents was selected for the final analysis. The main factors contributing to the resilience of volunteers at the 3 stages of pre-, during, and post-disasters were classified into 3 groups of individual, environmental, and organizational. Important factors affecting resilience of volunteers in disasters included previous disaster response experience and disaster-related training. Resiliency should be deemed integral to relief operations. Considering the main factors affecting volunteers' resiliency, it is highly suggested that organizations active in humanitarian endeavors explore the factors impacting on resilience among their volunteers via various research methods and seek to select those with higher degrees of resilience in order to avert untoward consequences in their missions.